1 /*
2 * SPDX-License-Identifier: ISC
3 *
4 * Copyright (c) 2013-2018 Todd C. Miller <Todd.Miller@sudo.ws>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 /*
20 * This is an open source non-commercial project. Dear PVS-Studio, please check it.
21 * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
22 */
23
24 #include <config.h>
25
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <unistd.h>
30 #include <fcntl.h>
31 #include <errno.h>
32
33 #include "sudoers.h"
34 #include "sudo_digest.h"
35
36 unsigned char *
sudo_filedigest(int fd,const char * file,int digest_type,size_t * digest_len)37 sudo_filedigest(int fd, const char *file, int digest_type, size_t *digest_len)
38 {
39 unsigned char *file_digest = NULL;
40 unsigned char buf[32 * 1024];
41 struct sudo_digest *dig = NULL;
42 FILE *fp = NULL;
43 size_t nread;
44 int fd2;
45 debug_decl(sudo_filedigest, SUDOERS_DEBUG_UTIL);
46
47 *digest_len = sudo_digest_getlen(digest_type);
48 if (*digest_len == (size_t)-1) {
49 sudo_warnx(U_("unsupported digest type %d for %s"), digest_type, file);
50 goto bad;
51 }
52
53 if ((dig = sudo_digest_alloc(digest_type)) == NULL) {
54 sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
55 goto bad;
56 }
57
58 if ((fd2 = dup(fd)) == -1) {
59 sudo_debug_printf(SUDO_DEBUG_INFO, "unable to dup %s: %s",
60 file, strerror(errno));
61 goto bad;
62 }
63 if ((fp = fdopen(fd2, "r")) == NULL) {
64 sudo_debug_printf(SUDO_DEBUG_INFO, "unable to fdopen %s: %s",
65 file, strerror(errno));
66 close(fd2);
67 goto bad;
68 }
69 if ((file_digest = malloc(*digest_len)) == NULL) {
70 sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
71 goto bad;
72 }
73
74 while ((nread = fread(buf, 1, sizeof(buf), fp)) != 0) {
75 sudo_digest_update(dig, buf, nread);
76 }
77 if (ferror(fp)) {
78 sudo_warnx(U_("%s: read error"), file);
79 goto bad;
80 }
81 sudo_digest_final(dig, file_digest);
82 sudo_digest_free(dig);
83 fclose(fp);
84
85 debug_return_ptr(file_digest);
86 bad:
87 sudo_digest_free(dig);
88 free(file_digest);
89 if (fp != NULL)
90 fclose(fp);
91 debug_return_ptr(NULL);
92 }
93